     "structure"
     "transportation"
     "utilitiesCommunication"})
+
+(def processing-level-code-space-string "gov.nasa.esdis.umm.processinglevelid")
 
 (defn- generate-projects-keywords
   "Returns the content generator instructions for descriptive keywords of the given projects."

         [:gmd:processingLevelCode
          [:gmd:MD_Identifier
           [:gmd:code (char-string (-> c :ProcessingLevel :Id))]
           [:gmd:codeSpace (char-string "gov.nasa.esdis.umm.proessinglevelid")]
           [:gmd:description (char-string (-> c :ProcessingLevel :ProcessingLevelDescription))]]]]]
       (let [related-url-distributions (sdru/generate-distributions c)
             data-center-distributors (data-contact/generate-distributors (:DataCenters c))]

         [:gmd:processingLevel
          [:gmd:MD_Identifier
           [:gmd:code (char-string (-> c :ProcessingLevel :Id))]
           [:gmd:codeSpace (char-string processing-level-code-space-string)]
           [:gmd:description (char-string (-> c :ProcessingLevel :ProcessingLevelDescription))]]]]]
       (sdru/generate-service-related-url (:RelatedUrls c))
       (aa/generate-content-info-additional-attributes additional-attributes)
